The article I'm about to link to, by Oliver Reichenstein, is pretty terrible, but it's a good way for me to bring up something I've been meaning to talk about. First, the article: "Apple has been working on its file system and with iOS it had almost killed the concept of folders - before reintroducing them with a peculiar restriction: only one level! With Mountain Lion it brings its one folder level logic to OSX. What could be the reason for such a restrictive measure?" So, where does this crusade against directory structures (not file systems, as the article aggravatingly keeps stating) come from?

I use a mix of hand structured directories, and Windows 7 native search for organizing my stuff. This way, I can have my structured stuff - like software projects in perfect order, and never need to remember where I put a word document (they just go to an archive, which I can easily search).

But the phone model is completely broken. You can neither organize, nor search them. They are all belonging to apps. Even worse in WP7. For example if you want to attach a PDF from the web to an email, there is no way to do it. The PDF will automatically belong to Adobe Reader, and it can only view or delete them. The email app will not even look at those. And the PC transfer application (Zune) will not touch anything other than multimedia. You can share the link, though